Code Block CRC and HARQ-ACK Feedback for Reliable Radio Transmission
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication systems face inefficiencies in the transmission and reception of radio signals, particularly in handling Hybrid ARQ Acknowledgment (HARQ-ACK) payloads, which affect the reliability and efficiency of data transmission.
Innovation Solution
The method and apparatus involve attaching code block-based and transport block-based Cyclic Redundancy Checks (CRC) to code blocks and transport blocks, with HARQ-ACK payloads containing HARQ-ACK bits corresponding to code block groups, allowing for efficient transmission and reception of control information in wireless communication systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If code block-based CRC is attached to each code block and transport block-based CRC is attached to the transport block, then the reliability of data transmission is improved, but the device complexity increases due to multiple CRC checks
Solution Approach 1:
The transport block is segmented into multiple code blocks, each with its own CRC check. This segmentation allows independent error detection at the code block level while maintaining overall transport block integrity through the transport block-based CRC, thereby improving reliability without requiring complete retransmission of the entire transport block when errors are detected in individual code blocks.
Solution Approach 2:
CRC checks are attached in advance to each code block and to the transport block before transmission. This preliminary action enables the receiver to quickly identify and handle erroneous code blocks through HARQ-ACK feedback mechanisms, improving transmission reliability by preventing error propagation while managing complexity through pre-configured error detection capabilities.
2Productivity
If HARQ-ACK payload includes multiple HARQ-ACK bits corresponding to code block groups, then the efficiency of acknowledgment transmission is improved, but the loss of information increases due to potential bit errors in the payload
Solution Approach 1:
The HARQ-ACK payload transmits multiple acknowledgment bits corresponding to different code block groups, enabling fine-grained feedback about the reception status of each group. This feedback mechanism allows the transmitter to selectively retransmit only the erroneous code block groups, improving acknowledgment efficiency while the CRC protection on the payload itself prevents loss of information by detecting and correcting transmission errors in the acknowledgment bits.
Solution Approach 2:
Different portions of the transport block (code block groups) are acknowledged independently with dedicated HARQ-ACK bits. This local quality approach allows the system to treat each code block group according to its specific reception quality, improving overall efficiency by avoiding unnecessary retransmissions of correctly received groups while protecting against information loss through selective error handling.
Data Source
AI summary
The present invention relates to a wireless communication system, and more particularly, to a method and apparatus for receiving information on a number N of a code block group defined for one transport block from a base station through an upper layer signal, receiving a first transport block including a plurality of code blocks from the base station through a physical layer channel, and transmitting HARQ-ACK payload including HARQ-ACK information on the first transport block to the base station. Preferably, a code block-based CRC is attached to each of the code blocks, a transport block-based CRC is attached to the first transport block, and the HARQ-ACK payload includes a plurality of HARQ-ACK bits corresponding to M code block groups for the first transport block.